Hello, as I also just encountered the issue with a complete black screen and no wifi logger, I wanted to share that removing the wifi board from the inverter at least turned the screen back on. There are two youtube videos that show the small wifi board and one even recommends how to fix it here: https://www.youtube.com/watch?v=5pgZurPpJqI, https://www.youtube.com/watch?v=3j808UvKWDg. At least the screen is now working and I will check if the wifi board can be replaced or fixed, but it seems to me that that small board is a common point of failure. And if anybody has experience with the same issue, I am happy for any advice :)